<script>
  class AppAnalytics extends HTMLElement {
    connectedCallback() {
      (function (i, s, o, g, r, a, m) {
        i['GoogleAnalyticsObject'] = r;
        i[r] = i[r] || function () {
          (i[r].q = i[r].q || []).push(arguments)
        }, i[r].l = 1 * new Date();
        a = s.createElement(o),
          m = s.getElementsByTagName('body')[0];
        a.async = 1;
        a.src = g;
        m.parentNode.insertBefore(a, m)
      })(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga');
      ga('create', this.getAttribute('key'), 'auto');
      ga('send', 'pageview');
    }
  }
  customElements.define('app-analytics', AppAnalytics)
</script>
